Yeah, definitely a good idea. I remember some years ago seeing a guy badly smash up his legs, with multiple compound fractures. Saw the whole crash and stuck around for about half an hour holding the broken pieces together waiting for the ambulance to hurry up and get there, and trying to keep the guy alive. He survived, but lost one leg. If those barriers (skirts) were in place, he might have stood a better chance of keeping his leg and minimising his internal injuries.
Those wire barriers are far far worse. There is not much on the roads that are motorcyclist friendly.